2026 ICD-10-CM Diagnosis Code S01.80XAUnspecified open wound of other part of head, initial encounter

ICD-10-CM Codes›S00–T88›S00-S09›S01

ICD-10-CM S01.80XA
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S01.80XA is a billable ICD-10-CM diagnosis code for unspecified open wound of other part of head, initial encounter. The 7th character A marks it as an initial encounter code, used while the patient is receiving active treatment. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 604 through 605, 963 through 965. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Any dental condition including traumatic injury; and Open wounds of head and neck, initial encounter.

Code Identity

ICD-10-CM Code
S01.80XA
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified open wound of other part of head, initial encounter
Short Description
Unspecified open wound of other part of head, init encntr
Parent Code
S01.80
Unspecified open wound of other part of head

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS00-S09Injuries to the head
CategoryS01Open wound of head
This CodeS01.80XAUnspecified open wound of other part of head, initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Avulsion of circumoral region of face
  • Avulsion of forehead
  • Fracture of alveolus, open
  • Fracture of angle of mandible
  • Fracture of bone of nasal sinus
  • Fracture of frontal bone
  • Fracture of frontal sinus
  • Fracture of temporal bone
  • Glass in face
  • Glass in forehead
  • Glass in head
  • Multiple open fractures of facial bones
  • Multiple open wounds of face
  • Multiple open wounds of head
  • Open dislocation of jaw
  • Open division, jaw ligament
  • Open fracture of alveolar ridge of left maxilla
  • Open fracture of alveolar ridge of maxilla
  • Open fracture of alveolar ridge of right maxilla
  • Open fracture of body of left half of mandible
  • Open fracture of body of mandible
  • Open fracture of body of right half of mandible
  • Open fracture of condylar process of left mandible
  • Open fracture of condylar process of right mandible
  • Open fracture of frontal sinus
  • Open fracture of left half of mandible
  • Open fracture of left mandibular angle
  • Open fracture of left maxilla
  • Open fracture of mandible, angle of jaw
  • Open fracture of mandible, condylar process
  • Open fracture of maxilla
  • Open fracture of naso orbital ethmoid
  • Open fracture of occipital bone
  • Open fracture of ramus of left half of mandible
  • Open fracture of ramus of mandible
  • Open fracture of ramus of right half of mandible
  • Open fracture of right half of mandible
  • Open fracture of right mandibular angle
  • Open fracture of right maxilla
  • Open fracture of temporal bone
  • Open traumatic bilateral jaw dislocation
  • Open wound of chin
  • Open wound of face
  • Open wound of forehead
  • Open wound of jaw
  • Open wound of nasal sinus
  • Traumatic cerebral edema
  • Traumatic cerebral edema with open intracranial wound
  • Traumatic dislocation of temporomandibular joint

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Open wound of head (S01). Use the following options for the applicable episode of care:

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026, published by CMS and the National Center for Health Statistics.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR DEN001
Any dental condition including traumatic injury
Default principal diagnosis: inpatient No · outpatient No
CCSR INJ011
Open wounds of head and neck, initial encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Wounds and Injuries

An injury is damage to your body. It is a general term that refers to harm caused by accidents, falls, hits, weapons, and more. In the U.S., millions of people injure themselves every year. These injuries range from minor to life-threatening.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert S01.80XA to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
873.42 Open wound of forehead
Approximate The match is approximate rather than exact.
ICD-9-CM
873.44 Open wound of jaw
Approximate The match is approximate rather than exact.
ICD-9-CM
873.49 Open wound of face NEC
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About S01.80XAOverview

Is S01.80XA (Unspecified open wound of other part of head) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report unspecified open wound of other part of head, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character A in S01.80XA mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for unspecified open wound of other part of head, such as an emergency visit or first evaluation.

What MS-DRG does S01.80XA group to?

When unspecified open wound of other part of head, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 604, 605, 963, 964, 965, with relative weights from 0.9160 to 2.7338 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of S01.80XA?

Under the General Equivalence Mappings, unspecified open wound of other part of head, initial encounter converts to ICD-9-CM 873.42 (open wound of forehead), 873.44 (open wound of jaw), and 873.49 (open wound of face NEC). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.